Rudiment Research In Application Of Wave Spectral Numerical Models

Either human economic activities or state military actions all rely on advanced ocean technology, while immediate and accurate wave forecast will act as an important safeguard of security. At the same time, design for near-shore and off-shore constructions needs wave parameters under extreme and normal conditions. However, field data of deep water is rarely offered. At present, with the development of the science and technology, wind conditions can be deduced from various satellite climograph, this paper will adopt wave spectral numerical models to offer wave conditions with enough resolution and accuracy, taking into account that errors may occur during directly evaluating wave parameters from empirical formulas.This paper will use WAVEWATCH â…¢ mode to calculate global wave field with wind data form NCEP, and results will be verified by NCEP Analyzed material and provide boundary conditions for ocean scale computation. Computations with wind data from ECWMF, QSCAT/NCEP, QSCAT Ievel3 will be carried out to test sensitivity of this model. Ocean scale computation will solve the problem that wave numerical computations lack of extern boundaries. In the paper, SWAN model will be used for the computation near-shore wind wave for East China Sea. The boundary is supplied by WAVEWATCH model and a nested computation is carried out to reduce the effect from inaccurate lateral boundary conditions on the premises of accuracy assurance.The verified results shows that under common weather conditions, method of this paper will provide wave field with enough resolution and accuracy, while WAVEWATCH model described the wave-wave nonlinear interactions well. But under the effect of strong storm, this mode appears to underestimate the lower values, but it provides relatively correct distribution of wave height. Verified results of SWAN model shows that nested computation of different scales will sufficiently depict the refined characters of wind wave.